Baader Contrast Booster® Filter

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Baader Contrast Booster® Filter

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€ 89.00 Price excl. German VAT tax (19%): € 74.79

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  • Baader Contrast Booster® Filters completely eliminates false colour
  • Removes the bluish "hue" (=lack of contrast) during lunar, planetary, solar and terrestrial observation
  • Boosts contrast and sharpness for fast achromatic telescopes - with over 95% transmission
  • Planeoptically polished, non-ageing sealed coating edges
  • Removes unsharp stars images when using red-sensitive digital and CMOS-cameras

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€ 89.00 Price excl. German VAT tax (19%): € 74.79

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What's the actual size of your 2" filters in "mm" with and without frame/ring? What step down adapter is suggested from a 52 mm to "-- mm"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)

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What are the threads and pitch of your 1.25" and 2" filters?
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)

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Good morning Sir. I asked few weeks ago, without ansrwers form you. The next 9th November, occurs the daylight occultation between the Moon and ad Venus . It's better to photograph (with lens and camera) the moon and occultaion phenomena with this 'contrast enhancer' or with classic circ. polarizer filter ? The goals is the better contrast wiht windows and the moon-sky with moon)
Question by: Livio on Oct 10, 2023 12:31:00 AM | 1 Answer(s)

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I am looking for recommendations for a filter to enhance contrast for visual observation of planets (really only Jupiter, Saturn, Mars). I do no astrophotography. I have a Borg 90Fl apochromat (f/5.6) and TeleVue eyepieces.

I do not want to get into color filters -- there are benefits of course, but it is too laborious.

Would you recommend (a) this filter, your Contrast Booster; or (b) your Moon and Sky Glow filter #2458305A, or (c) something else (other than color filters)?
Question by: Joseph Guth on Dec 13, 2023 12:09:00 AM | 1 Answer(s)

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How much does this filter protrude from the barrel of an eyepiece?
Question by: Jan on Jun 11, 2023 2:29:00 PM | 1 Answer(s)

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Good morning Sir. Next 9th November '23, daylight the moon will occult (from my site, from 10.30 to 13.30 round) Venus. I am looking a solution with filter to better contrast the moon and Venus for photographing the event. It is daylight.
It is the boster filter an alternative to clasica circ. polarizier ?
Thansk for reply
Question by: Livio Scalmati on Sep 5, 2023 2:16:00 PM | 1 Answer(s)

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Is the Baader Contrast Filter good for moon, planets and nebulae? If so I have a Tele Vue 2” 27mm Panoptic, Tele Vue 1.5” 18mm & 8mm Radians. (My scope if an 8” Meade LS ACF.) What would be the best size filter to get, since I don’t want to buy both, at least not yet?
Question by: Craig Keating on Aug 12, 2018 7:32:00 PM | 1 Answer(s)

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1¼" and 2" Baader Contrast Booster®

Planeoptically Polished and Phantom Group Coated

Baader Kontrast Booster
Baader Contrast Booster®

Discover your telescope anew – with the Baader Contrast Booster®:

A unique filter for many different astronomical tasks – incomparable in acuity to combinations of generic colour filters, made of raw polished glass – where surface inaccuracy adds up in the optical wave front to an unbearable degree. Especially designed to improve the beginners telescopes – to provide a professional replacement for the simple "dark green" Moon & Solar-Filters made of "raw polished" glass.

For Solar Observation use only in combination with Baader AstroSolar Safety Film!


  • Eliminates the colour error of economy refractors.
  • Clearly puts the real quality of the lens on display.
  • Removes the bluish "hue" (=lack of contrast) during lunar-, planetary-, solar- and terrestrial observation.
  • Strongly emphasizes surface detail on Jupiter and Mars. If you have never seen the GRS (Great Red Spot) on Jupiter – with this filter you will.
  • Over 95 % transmission – provides a bright, brilliant image compared to the usual dark green colour filters, used to bring out detail on Jupiter. Colour recognition will be retained.
  • The ultimate in lunar filters. Moon (and Sun) appear much more natural in color (with a slight yellowish tint), compared to the usual low priced dark green Moon-filters, usually offered for beginners telescopes.
  • Completely removes distracting false colour and the resulting smeared and washed out image details. You have never ever seen the Moon or the Sun (with AstroSolar Safety Film) so tack sharp in an economy priced telescope.
  • Blocks atmospheric "stray light" (skyglow). Sky background turns into pitch black.
  • Fits into standard filter threads. Filter thread on both sides, so it can be stacked with other filters
  • Includes UV/IR-cut-filter to remove unsharp stars caused by unfocussed inrared light on images taken with red-sensitive digital cameras.
  • Planeoptically polished, suitable for being used in front of a binocular viewer, or for a-focal image projection during digital imaging (way in front of the focal plane).
  • No deterioration of resolution with magnifications of 200x and more – as with "raw polished" (flame polished) glass.
  • Substrate (glass melt) Neodymium doped glass.
  • Coating / rear face: 7-layer hard-multicoating, featuring 0.25% reflection.
  • Coating / front face: 23-layer dielectric long pass blocker.
  • Ionbeam hardened coatings on both faces, absolutely scratch resistant – may be cleaned any time without fear with Baader Optical Wonder Fluid.
  • A significant part of city light air pollution, as well as atmospheric Airglow is removed from the telescopic image.
The transmission line of Baader Contrast Booster®
Transmissionskurve mit UV/IR Sperrfilter
The transmission line of Baader Contrast Booster®. The integrated UV/IR cut filter is needed for sharp stars in photography.

The transmission curve shows the light transmittance in percent versus the light wavelength in nanometres. Note the high transmission for visual observations of H-alpha (98%), H-beta (87%) and OIII (82%).

In a light polluted town or city mercury and sodium vapour street lights emit at 435nm and between 570-590nm. Here the filter transmission is between 0.3 and 3%.

The Baader Contrast Booster with integrated UV / IR cut filter is both an optimal filter for visual observations as well as for CMOS images from light-polluted big city and metropolitan area.

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Antares 203/07/2020 22/07/202015:15
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Baader Contrast Booster Filter
I could really see Jupiter's Great Red Spot for the first time!
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Andrew Holley 62/03/2016 03/03/201615:00
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I would like to take this opportunity of thanking you for the outstanding quality of the Baader Contrast Booster Filter which I came across by accident. Having researched the range of deep sky filters I came to the conclusion that a lot of the claims made by other astronomical filter manufacturers were extreme to say the least. To cut a long story short, the Baader filter does what it says and does it well. It may not make certain objects leap out but that is not what I expected. What I expected was a filter that would make my 8 inch reflector perform to the best it could with the least amount of light polution (both natural and man made),without losing light from the object under observation. That it does extremely well.

I will use this filter every time for general viewing as well as for deep sky objects. I look forward to trying other Baader products, particularly the solar film to view the sun (which I have never been into before).
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